Zinsser covers up aerosol is a low odour vertical aerosol that is a stain killer and ceiling touch up paint in one it seals water damaged ceilings and sprays vertically for ease of use its perfect for touch up when you dont want to repaint the entire ceiling due to spot damage zinssers stain blocking primer technology is incorporated into this new generation product that offers a flat white finish that matches most new acoustical ceiling tiles and white ceiling paints covers up is an odourl